per tonne of weak acid (before concentration) produced. 2[23. SULPHURIC ACID
. PLANT. Emission standards. Limiting concentration in mg/Nm3, unless stated.
423
The Environment (Protection) Rules, 1986
Sr. No.
Industry
Parameter
Standards
1
2
3
4
1
OMITTED
19.
CALCIUM CARBIDE
[18.
Particulate Matter Emission - Kiln
250 milligramme per normal cubic metre.
- Arc Furnace
150 milligramme per normal cubic metre.
20.
CARBON BLACK
Particulate matter Emission
150 milligramme per normal cubic metre.
21.
COPPER, LEAD AND ZINC SMELTING
Particulate Matter Emission in Concentrator
150 milligramme per normal cubic metre.
Emission of Oxides of Sulphur in Smelter & convertor
Off-gases must be utilized for sulphuric acid manufacture. The limits of sulphur dioxide emission from stock shall not exceed 4 kilogramme per tonne of concentrated (one hundred per cent acide produced).
Emission of Oxides of Nitrogen
3 kilogramme of oxides of nitrogen per tonne of weak acid (before concentration) produced.
22.
NITRIC ACID (EMISSION OXIDES OF NITROGEN)
2
SULPHURIC PLANT
[23.
ACID Emission standards Limiting concentration in mg/Nm3, unless stated Plant capacity for 100% concentration of Sulphuric Acid (tonne/day)
1 2
Sr. No.18 relating to “Aluminum” and entries relating thereto omitted by Rule 2(II) of the Environment (Protection) First Amendment Rules, 2006 notified by G.S.R. 46(E), dated 3.2.2006. Substituted by Rule 2(I) of the Environment (Protection) Third Amendment Rules, 2008 notified by G.S.R. 344(E), dated 7.5.2008.
424
The Environment (Protection) Rules, 1986
Sr. No.
Industry
Parameter
Standards
1
2
3
4
Existing Unit
New Unit
(SO2) upto 300
1370
1250
Above 300
1250
950
Acid Mist/Sulphur
Up to
300
90
70
Trioxide
Above 300
70
50
Sulphur dioxide
Note: (i)
Scrubbing units shall have on-line pH meters with auto recording facility.
(ii)
The height of the stack emitting sulphur-dioxide or acid mist shall be of minimum of 30 metre or as per the formula H=14(Q) (0.3) (whichever is more). Where ―H‖ is the height of stack in metre; and ―Q‘ is the maximum quantity of SO2 expected to be emitted through the stack at 110 per cent rated capacity of the plants and calculated as per the norms of gaseous emission.
(iii)
Plants having more than one stream or unit of sulphuric acid at one location, the combined capacity of all the streams and units shall be taken into consideration for determining the stack height and applicability of emission standards.
(iv)
Plants having separate stack for gaseous emission for the scrubbing unit, the height of this stack shall be equal to main stack].
